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but less than or equal to 30 min/in drop. For the Site to utilize a standard septic system, one percolation test must demonstrate a satisfactory percolation rate within the proposed septic system disposal field. Details and results of the percolation testing are summarized in the following table. Table 2. Percolation Test Summary Test No., Percolation Test Percolation Rate Test Duration Comments Date Tested Depth (ft.) (minutes/inch) (see notes) Pi-S Satisfactory 2/26/26 1.84 22.7 4 hr. Shallow Test perc. rate P1-D Satisfactory 2/26/26 7.64 2.03 1 hr. perc. rate Deep Test Note: A satisfactory percolation rate for a "shallow" test is greater than 1 but less than or equal to 60 min/in. A satisfactory percolation rate for a"deep"test is greater than 1 but less than or equal to 60 min/in. 1 Per San Joaquin County Environmental Health Department, a rate between 5.0 and 30.0 min/in requires an 8-foot separation between the bottom of dispersal system and ground water, or mitigation by system design or enhancement. 2 Per San Joaquin County Environmental Health Department, a rate between 1.0 and 5.0 min/in requires an 8-foot separation between the bottom of dispersal system and ground water, or mitigation by system design or enhancement. Discussion of Percolation Test Results The soils near the proposed septic disposal area for the new ADU have demonstrated satisfactory percolation rates for the use of a standard septic system in accordance with the requirements of the San Joaquin County Environmental Health Department. The percolation test is considered representative of soils within a 100-foot radius of the test location. Discussion of Septic System Sizing Septic system construction should follow the San Joaquin County On-Site Wastewater Treatment Systems Standards (2017) where applicable. In this area, most septic systems utilize leach lines with seepage pits. LOGE 2611 Page 7